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string strPath = Application.StartupPath;
System.IO.DirectoryInfo di = new System.IO.DirectoryInfo(strPath);
MessageBox.Show(di.FullName); //本级目录
MessageBox.Show(di.Parent.FullName); //上一级目录
di.Parent.FullName + "\\images\\" + int_num+".jpg"; //用上级目录
pictureBox1.Image = Image.FromFile(Application.StartupPath + "\\Images\\" + int_num + ".jpg");